mckim



2 Sheets-Sheet I (No Model.)

G. W. MoKIlVI.

MACHINE FOR JOINTING STAVES.

fNo. 357,615.

Patented Feb. 15, 1887.

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UNITED STATES PATENT OFFICE.

GEORGE WV. MOKIM, OF MARTINS FERRY, OHIO, ASSIGNOR TO CHARLES E. MOKIM, OF SAME PLACE.

.MACHIINE FOR JOINTING STAVES.

SPECIFICATION forming part of Letters Patent No. 357,615, dated February 15, 1887.

Application filed May 14, 1886. Serial No. 202,149.

To all whom it may concern.

Be it known that I, GEORGE WV. MOKIM, a citizen of the United States, residing at Martins Ferry, in the county of Belmont and'State of Ohio, have invented certain new and useful Improvements in Machines forJointing Staves; and I do declare the following to be afull, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to the letters 'and figures of reference marked thereon, which form a part of this specification.

My invention consists in the improved construction, arrangement, and combination of parts of a machine for jointing staves, which is designed to make a perfect stave-joint, and which will efl'ect a great saving both in time and material, all as will be hereinafter fully described, and pointed out in the claims.

Referring to the accompanying drawings, Figure 1 is a perspective view of my improved machine for jointing staves, showing in dotted lines a stave adjusted in operative position upon the breast-plate of the machine. Fig. 2 is a front elevation of the same. Fig. 3 is a vertical sectional View taken on the line :0 a), Fig. 2, of the drawings; and Fig. 4 is a vertical sectional View taken on line y y, Fig. 3, of the drawings. v

The same letters of reference indicate corresponding parts in all thefigures.

Referring tothe several parts by letter, A represents the cast-iron frame in which the various operative portions of the mechanism are mounted. In the upper portion of this frame, parallel to the front thereof, is journaled in the bearings B the 'drive'shaft O, having on one of its ends the loose and tight pulleys D E, and on which is centrally mounted the cutting-cylinder F. This revolving cylinder F is made of such proportions in length and diameter as may be required for the different-length staves, and is constructed with the central diaphragm or partition, G, which divides the interior space of the cuttingcylinder in half, and the drive-shaft O extends from the center of this diaphragm. The outer surface of the cylinder F is made concave, as most clearly shown in Fig. 4 of the drawings,

. cylinder.

(N0 model.)

to conform to the curvature or form of the edge of the stave, and the inner face of the cylinder flares outwardly toward each outer end thereof, conforming to the curvature of the concave outer face of the cylinder, for the purpose hereinafter specified. The cuttingcylinder is provided with the three sets of knives, H H, (although a greater number of knives might be employed, if desired,) these knives being bolted,to seats I, cast on the inner face of the cylinder, by bolts J, passing through slots K K near each end of each knife, and by means of these slots the knives can be moved forward to take up wear. These knives are arranged obliquely to the axis of the cut ting-cylinder, as shown in the drawings, so that they cut with a shear or draw cut, and their inner ends extend beyond the central line of the cylinder, so as to practically overlap one another, thereby causing a clean cut to be made on the staves, and effectually preventing any small rib of wood being left at the center of the edge of the stave, as will be readily understood. a

To the front upper portion of the main frame A is secured the breast-plate L, the rear vertical edge of which is shaped to conform to v the shape of the concave outer surface of the cutting-cylinder, being made approximately convex, as shown, and this breast-plate is adbolts or set-screws M, passing through the transverse slots N near the ends of the breastplate, so that the inner curved edge of the breast-plate may be moved nearer to or farther from the cutting-cylinder, as desired.

To the forward side of the cross-piece of the main frame, which supports the adjustable breast-plate, are secured the slotted guidebrackets O O, in the longitudinal slots P of which slide the upper ends of the side pieces of the gage-frame Q, the said side pieces being pivotally secured at their lower ends upon a cross-rod, R, in thelower forward portion of the frame A, and being provided atasuitable height with the knee-board S, while to the upper ends of these side pieces are secured the 'justably secured upon the frame A by the rearWardly-projecting arms TT, which serve to hold the stave in its proper position upon the breast-plate with relation to the cutting- One side of the knee-board is rigidly IOO secured to its side piece of the gage-frame, while the other sideis adj ustably secured to the other side of the gage-frame by means of the set-screws U U, passing through the transverse slots V V in that side piece of the said frame, the object of this arrangement being to adjust the gages as desired.

Upon the gage-plate is secured the adj ustable end gage, \V, which is adj usted, when the stave has been placed upon the breast-plate, as shown in dotted lines in Fig. 1 of the drawings, so as to bring the center of the stave exactly to the center of the cutting-cylinder, and prevent its slipping laterally.

In operation, the stave to be jointed is laid upon the breast-plate and the end gage, I, adjusted so as to bring the center of the stave exactly to the center of the cutting-cylinder, when, by pressing his knee against the kneeboard of the gage-frame, the operator holds the stave firmly in its adjusted position.

In order to regulate the bulge or curvature of the edges of the staves, the oblique knives H are curved in the following manner: Beneath that portion of the knives which lies between their end slots, K K, and their seats I is placed thepacking X, which serves to curve the cutting-edge of the knife, as shown in Fig. f the drawings, so as to give the desired bulge or quarter-bulge to the staves, as will be readily understood.

Beneath the cuttingcylinder and the breastplate is secured on the curved guideways Y Y the rearwardly and downwardly curved bot- M tom Z, the forward upper edge of which extends up forward of the cross-piece which supports the breast-plate, so that all shavings, 820., which may be thrown by the cutting-cyb inder upon the breast-plate or over its outer edge, and which will be blown forward off of the breast-plate by the current of air caused by the rapidly-revolving cutting-cylinder, will drop upon and be caught by the forwardly and upwardly projecting edge of the curved bottom Z, and will slide down the said curved bottom through the space between the same and the cross-piece which supports the breastplate, and will be finally discharged at the rear lower end of the curved bottom.

The slots through which the knives of the cutting-cylinder project are of sufficient width to permit the shavings, &c., cut from the staves by the knives to pass through the said slots and fall inside of the cutting-cylinder, and they will fall from the outwardly-flaring ends of the cylinder upon the curved bottom Z, while any shavings which may remain in the slots after the knives pass the point where they cut the staves will be blown out upon the outer face of the cylinder and down upon the curved bottom Z by the air which is drawn into the flaring months or ends of the cuttingcylinder as it rapidly revolves, the central diaphragm or partition, G, which divides the interior space of the cutting-cylinder vertically into two parts, cutting off communication between the two ends or heads of the cut ting-cylinder, and thereby causing the air sucked in at each end of the said cylinder to be forced out through the slots K, as there is no other egress for it, thereby automatically keeping the said slots always perfectly clear, and preventing them from becoming choked up and inoperative, which would be otherwise liable to occur. If it were not for the said dividing diaphragm or partition the air would pass freely through the large interior space of the cylinder and permit of the slots K becoming choked up by the shavings. When it is desired, however, to discharge the shavings, Ste, through the ends of the cutting-cylinder, I secure to the inner surface of the cutting-cylinder inclosing the said slots the curved guide-receptacles A, increasing in size toward their outer ends, which convey the cuttings to the outer ends of the cutting-cylinder, where they fall dircctl y upon the curved bottom, and the current of air caused by the rapidly-revolving cutting-cylinder will blow the cuttings out off of the curved bottom Z at the rear end of the machine. The obliquelyarranged knives, cutting close to the rear vertical edge of the breast-plate, will cut with a clean draw or shear out, and each pair of knives is arranged, as shown, :50 that one knife of the pair will out clearly through its side of the stave before the other knife of the pair engages with its side thereof, thereby reducing friction to the least possible degree.

From the foregoing description, taken in connection with the accompanying drawings, the construction, operation, and advantages of my improved machine for jointing staves will be readily understood. It will be seen that my improved machine is exceedingly simple in construction, and is therefore not liable to break or get out of order, while at the same time it is very effective in its operation, and will effect a saving in time, labor, and material.

Having thus described my invention, what I claim, and desire to secure by Letters Patent of the United States, is-

1. In a stave-jointing machine, the combination, with the cutting-cylinder having the concave outer surface, having its inner surface curved to correspond to the curvature of its outer surface, and having the central partition, of the knives arranged in pairs obliquely to the axis of the cylinder, and having their inner ends extending slightly beyond the central line of the cylinder, as and for the purpose shown and described.

2. In a stave-jointing machine, the combination of the cutting-cylinder having the concave outer surface, having its inner surface curved to correspond to the curvature of its outer surface, and having the central partition, the knives arranged in pairs obliquely to the axis of the cylinder and having their inner ends extending beyond the central line of the cylinder, and the curved receptacles increaslIO ing in size toward their outer ends and secured to the inner surface of the cylinder inclosing the slots through which the said knives extend, substantially as described.

I 3. The combination, with the cylinder having the concave outer surfaceand the oblique slots, and having the seats on its inner surface, of the knives having the slots near each of their ends, and the setscrews for securing the knives in their adjusted positions, substantially as set forth.

4. The combination, with the cylinder having the concave outer surface and the oblique slots, and having the seats on its inner surface, of the knives having the slots near each of their ends and adjustabl y secured upon the said seats by means of the set-screws, and the packing arranged between the-said knives and their seats, in the manner and for the purpose herein shown and described.

5. The combination, with the cutting-cylinder having the concave outer surface and the knives, arranged as described, of the adjustable breast-plate having the convex inner side and the adjustable end gage, arranged as described.

6. The combination, with the cutting-cylinder and the breast-plate, arranged as described, of the inclined bottom extending beneath the cutting-cylinder and the breastplate, and having its forward end extended up in advance of the breast-plate, so as to leave a space between it and the cross-piece which supports the breast plate, as and for the purpose set forth.

7. The combination, with the breast-plate, of the slotted guide-brackets and the gageframe pivotally secured at its lower end, having the knee-board, and provided at the upper end of its side pieces with the rearwardlyside pieces having the transverse slots, while to the other is rigidly secured the knee-board having the set-screws Which pass through the said slots, as and for the purpose set forth.

In testimony whereof I affix my signature in presence of two witnesses.

GEORGE W. MOKIM. W'itnesses: y

W. M. LUPTON, GEO. A. MOKIM. 

